ビジネスロジック実装進化論 - An Evolution of Business Logic Implementation

ϏδωεϩδοΫ ࣮૷ਐԽ࿦ 2010೥10݄27೔ ࠤ౻ ڡ߶ http://ameblo.jp/ouobpo An Evolution of Business
Logic Implementation

• ࢓ࣄ - Software AGגࣜձࣾ άϩʔόϧίϯαϧλϯγʔ αʔϏε webMethodsίϯαϧλϯτ - ॻ੶ͷࣥචʗ຋༁ͳͲ
• Web - ϒϩά: http://ameblo.jp/ouobpo - Twitter: tadayosi • झຯ - KindleͰಡॻ - ೔ຊϕδλϦΞϯڠձձһ ࠤ౻ ڡ߶ʢ͞ͱ͏ ͨͩΑ͠ʣ http://www.ﬂickr.com/photos/robertnyman/189691155/

ʰϓϩάϥϛϯάScalaʱ೥໌͚ൃചʂ ೔ຊޠ൛

Domain Modelύλʔϯ ͸೉͍͠ʁ

http://www.martinfowler.com/eaaCatalog/domainModel.html

Domain Modelύλʔϯ͸... •࣮ࡏ͢Δ •௒ਓతͳϚδοΫͰ͸ͳ͍ •ϏδωεϩδοΫ࣮૷ͷࢼߦࡨޡͷதͰࣗવ ʹḷΓண͘ಓͰ͋Δ

ϓϩάϥϚᴈ໌ظ http://www.ﬂickr.com/photos/nickhubbard/2878833485/

#!/usr/bin/env perl use strict; use CGI::Carp qw(fatalsToBrowser); require ‘util.pl’ my
%FORM = util::read_form('POST', 'utf8'); # ϏδωεϩδοΫʁ ... print "Content-type: text/html\n\n"; print<<HTML_END; <html> <head> <title>஫จ֬ೝ</title> </head> <body> ... </body> </html> HTML_END

PerlʗCGI order.pl DB ϑΝΠϧ Ϗδωε ϩδοΫ HTML σʔλ ΞΫηε

public class OrderServlet extends HttpServlet { protected void service( HttpServletRequest
request, HttpServletResponse response) { processOrder(request, response); request .getRequestDispatcher( “/order/confirm.jsp”) .forward(request, response); } private void processOrder( HttpServletRequest request, HttpServletResponse response) { // ϏδωεϩδοΫʁ ... } ...

ServletʗJSP OrderServlet DB XML Ϗδωε ϩδοΫ σʔλ ΞΫηε /order/conﬁrm.jsp HTML

ϨΠϠΞʔΩςΫνϟ ͷൃݟ http://www.ﬂickr.com/photos/bloggingbookshelf/5084749109/

υϝΠϯ૚ σʔλΞΫηε૚ ϓϨθϯ૚ Transaction Script DB ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ
αʔϏε ʢϢʔεέʔεAʣ αʔϏε ʢϢʔεέʔεBʣ αʔϏε ʢϢʔεέʔεCʣ αʔϏε ʢϢʔεέʔεDʣ DAO DAO DAO

public class ProcessOrderServiceImpl implements IProcessOrderService { private IOrderDao fOrderDao; private
ICustomerDao fCustomerDao; public List<OrderBean> findOrders( CustomerBean customer) { ... } public void confirmOrder( OrderBean order, CustomerBean customer) { ... } public void cancelOrder( OrderBean order, CustomerBean customer) { ... } ...

Transaction Script • ϓϨθϯɺϏδωεϩδοΫɺσʔλΞΫη εͷ֤૚͸෼཭͞ΕΔ • ϏδωεϩδοΫ͸Ϣʔεέʔε୯ҐͰߏ੒͞ ΕΔ × ϏδωεϩδοΫ͕ෳࡶʹͳΔͱɺίʔυॏ
ෳͷ੍ޚ͕೉͘͠ͳΔ

Table Module υϝΠϯ૚ σʔλΞΫηε૚ ϓϨθϯ૚ DB ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ
αʔϏε ʢϢʔεέʔεAʣ αʔϏε ʢϢʔεέʔεBʣ αʔϏε ʢϢʔεέʔεCʣ αʔϏε ʢϢʔεέʔεDʣ DAO DAO DAO ϩδοΫ ʢςʔϒϧXʣ ϩδοΫ ʢςʔϒϧYʣ ϩδοΫ ʢςʔϒϧZʣ

public class ProcessOrderServiceImpl implements IProcessOrderService { private IOrderLogic fOrderLogic; private
ICustomerLogic fCustomerLogic; public List<OrderBean> findOrders( CustomerBean customer) { return fOrderLogic.findByCustomer(customer); } public void confirmOrder( OrderBean order, CustomerBean customer) { fOrderLogic.confirm(order, customer); } public void cancelOrder( OrderBean order, CustomerBean customer) { fOrderLogic.cancel(order, customer); } ...

public class OrderLogicImpl implements IOrderLogic { private IOrderDao fOrderDao; private
ICustomerLogic fCustomerLogic; public List<OrderBean> findByCustomer( CustomerBean customer) { return fOrderDao. findByCustomerId(customer.getId()); } public void confirm( OrderBean order, CustomerBean customer) { ... } public void cancel( OrderBean order, CustomerBean customer) { ... } ...

Table Module • ϓϨθϯɺϏδωεϩδοΫɺσʔλΞΫη εͷ֤૚͸෼཭͞ΕΔ • ϏδωεϩδοΫ͸͞Βʹ2૚ʹ෼͔ΕΔ - Service Layer
ʹ Ϣʔεέʔε୯Ґ - υϝΠϯϩδοΫ ʹ DBςʔϒϧ୯Ґ • ࣮༻ϨϕϧͰ͸໰୊ͳ͍͕ɺίʔυʹϜμ͕ ଟ͘ඒ͘͠ͳ͍

ΩϟζϜΛ௒͑Δ http://www.ﬂickr.com/photos/matheus_momesso/4469788827/

૯শؔ਺ʢCLOSʣ ;;; Ϋϥεఆٛ (defclass order () ((number :accessor order-number ...)))
(defmethod confirm ((self order)) (... (order-number self))) ;;; ࣮ߦίʔυ (setq o (make-instance ‘order :number 12345)) (confirm o)

confirm(order); order.confirm();

૯শؔ਺ → ΦϒδΣΫτ class OrderLogic { static void confirm( OrderBean
order, CustomerBean customer) { order.getOrderNo(); ... OrderLogic .confirm(order, customer); class Order { String orderNo; void confirm( Customer customer) { this.orderNo; ... order.confirm(customer); Table Module Domain Model

Domain Model υϝΠϯ૚ σʔλΞΫηε૚ ϓϨθϯ૚ DB ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ ΞΫγϣϯ
αʔϏε ʢϢʔεέʔεAʣ αʔϏε ʢϢʔεέʔεBʣ αʔϏε ʢϢʔεέʔεCʣ αʔϏε ʢϢʔεέʔεDʣ ORM ORM ORM υϝΠϯ ΦϒδΣΫτ υϝΠϯ ΦϒδΣΫτ υϝΠϯ ΦϒδΣΫτ

public class ProcessOrderServiceImpl implements IProcessOrderService { private IOrderRepository fOrderRepository; private
ICustomerRepository fCustomerRepository; public List<Order> findOrders( Customer customer) { return fOrderRepository.findBy(customer); } public void confirmOrder(Order order) { order.confirm(); } public void cancelOrder(Order order) { order.cancel(); } ...

public class Order { private Customer fCustomer; public void confirm()
{ ... } public void process() { ... } public void cancel() { ... } ...

Domain ModelͷϝϦοτ • ࠶ར༻ੑɺϝϯςφϯεੑ͕ߴ͘ͳΔ • ϩδοΫͷஔ͖৔ʹ೰·ͳ͍ • ෳࡶͳϏδωεϩδοΫΛϞσϧʹΑͬͯ ՄࢹԽͰ͖Δ •
ίʔυͷࣈ໘͕γϯϓϧʹͳΓɺඒ͍͠

·ͱΊ •ίʔυͷॏෳഉআΛ௥ڀ͢Δͱɺࣗવ ͱTable Module·ͰḷΓண͘ •Table Module͕૯শؔ਺ʹΑΔOOͷ࣮ ૷ͱؾ͚ͮ͹ɺDomain Model΁ͷಓ͕ ୓͚Δ

࠷ޙʹ

“Architecture teams must not siphon off all the best and
brightest.” ΞʔΩςΫνϟνʔϜʹ ࠷΋༏लͳϝϯό ΛूΊͯ͸͍͚ͳ͍ɻ — Eric Evans, Domain-Driven Design

ςΫϊϩδ͔ΒυϝΠϯ΁ • ςΫϊϩδͷ׆༻ʹ๩ࡴ͞Ε͍ͯ ͳ͍ͩΖ͏͔ʁ - ސ٬ʹՁ஋Λ΋ͨΒ͢ͷ͸Πϯ ϑϥ΍ϑϨʔϜϫʔΫͰ͸ͳ͍ • ϏδωεʹਅͷྗΛ༩͑Δͷ͸ɺ υϝΠϯʹϏδωεϩδοΫ
http://www.ﬂickr.com/photos/wwworks/2222523486/

υϝΠϯΛઓ͍ൈͨ͘Ίͷ෢ث •ΦϒδΣΫτࢦ޲෼ੳʗ ઃܭͷجૅ •GRASPύλʔϯ - ৘ใΤΩεύʔτ - ߴڽू - ௿݁߹
•ඞཁͳͷ͸DIίϯς φɺORMɺRIAɺNoSQLͳ Ͳͷ஌ࣝͰ͸ͳ͍ʂ

υϝΠϯͰօ͞Μͷ ྗΛൃش͠Α͏ʂ

͋Γ͕ͱ͏ ͍͟͝·ͨ͠ʂ

ビジネスロジック実装進化論 - An Evolution of Business Logic ...

ビジネスロジック実装進化論 - An Evolution of Business Logic Implementation

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